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Note that the OP must use SMS, not MMS.

In the US it wasn't an issue. What was the trouble? Keep in mind I was sending it to one or two people. I have no doubt it doesn't work on a mass scale.

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JMP.chat does pure SMS by default, you have to ask to be part of the MMS beta.

I've only really tried AT&Ts gateways in the US from gmail, maybe something has changed but it never worked for me.

AT&Ts gateway worked for me around 2019. I was sending it from a domain that was set up with all the anti-spam things you have to set up to be a good sender (whatever rules so GMail etc don't dump all your messages right to spam, they are recorded but I don't recall them). It's possible that GMail was blacklisted because a lot of spammers had a ton of Gmail accounts.

Edit: Super important. You can turn that feature off per phone number. You (or your recipients) may have told att not to send them

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